Degradation of organic contaminants in the CoFe2O4/peroxymonosulfate process: The overlooked role of Co(II)-PMS complex

Cobalt ferrite (CoFe2O4) has been widely employed as a catalyst for the activation of peroxymonosulfate (PMS), in which hydroxyl radicals (•OH) and sulfate radicals (SO4•−) are generally recognized as the main reactive species responsible for the degradation of pollutants. In this study, we find tha...

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Main Authors: Xinhong Li, Zihao Zhao, Hongchao Li, Jieshu Qian
Format: Article
Language:English
Published: Elsevier 2021-11-01
Series:Chemical Engineering Journal Advances
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S2666821121000594
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spelling doaj-45f9a62f710a4e6887a243625985d1fe2021-07-11T04:29:23ZengElsevierChemical Engineering Journal Advances2666-82112021-11-018100143Degradation of organic contaminants in the CoFe2O4/peroxymonosulfate process: The overlooked role of Co(II)-PMS complexXinhong Li0Zihao Zhao1Hongchao Li2Jieshu Qian3Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaJiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaCorresponding author.; Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaJiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaCobalt ferrite (CoFe2O4) has been widely employed as a catalyst for the activation of peroxymonosulfate (PMS), in which hydroxyl radicals (•OH) and sulfate radicals (SO4•−) are generally recognized as the main reactive species responsible for the degradation of pollutants. In this study, we find that both one-electron transfer and oxygen-atom transfer reactions are involved in the CoFe2O4/PMS process, by using methyl phenyl sulfoxide (MPSO) as a chemical probe. Results from radical quenching and electron paramagnetic resonance (EPR) experiments indicate that the free radicals (i.e., •OH and SO4•−) play only a minor role in the degradation of sulfamethoxazole (SMX). A mechanism involving Co(II)-PMS complex both on the surface of CoFe2O4 and in solution as the dominant reactive species is proposed. Furthermore, the degradation performance of SMX under different conditions were investigated to further cognize the Co(II)-PMS complex-mediated oxidation process. This study broadens our understanding of the role of transition metal-based catalysts in the activation of PMS for the degradation of organic pollutants.http://www.sciencedirect.com/science/article/pii/S2666821121000594PeroxymonosulfateAdvanced oxidation processesCobalt ferriteWater treatmentCo(II)-PMS complex complex
collection DOAJ
language English
format Article
sources DOAJ
author Xinhong Li
Zihao Zhao
Hongchao Li
Jieshu Qian
spellingShingle Xinhong Li
Zihao Zhao
Hongchao Li
Jieshu Qian
Degradation of organic contaminants in the CoFe2O4/peroxymonosulfate process: The overlooked role of Co(II)-PMS complex
Chemical Engineering Journal Advances
Peroxymonosulfate
Advanced oxidation processes
Cobalt ferrite
Water treatment
Co(II)-PMS complex complex
author_facet Xinhong Li
Zihao Zhao
Hongchao Li
Jieshu Qian
author_sort Xinhong Li
title Degradation of organic contaminants in the CoFe2O4/peroxymonosulfate process: The overlooked role of Co(II)-PMS complex
title_short Degradation of organic contaminants in the CoFe2O4/peroxymonosulfate process: The overlooked role of Co(II)-PMS complex
title_full Degradation of organic contaminants in the CoFe2O4/peroxymonosulfate process: The overlooked role of Co(II)-PMS complex
title_fullStr Degradation of organic contaminants in the CoFe2O4/peroxymonosulfate process: The overlooked role of Co(II)-PMS complex
title_full_unstemmed Degradation of organic contaminants in the CoFe2O4/peroxymonosulfate process: The overlooked role of Co(II)-PMS complex
title_sort degradation of organic contaminants in the cofe2o4/peroxymonosulfate process: the overlooked role of co(ii)-pms complex
publisher Elsevier
series Chemical Engineering Journal Advances
issn 2666-8211
publishDate 2021-11-01
description Cobalt ferrite (CoFe2O4) has been widely employed as a catalyst for the activation of peroxymonosulfate (PMS), in which hydroxyl radicals (•OH) and sulfate radicals (SO4•−) are generally recognized as the main reactive species responsible for the degradation of pollutants. In this study, we find that both one-electron transfer and oxygen-atom transfer reactions are involved in the CoFe2O4/PMS process, by using methyl phenyl sulfoxide (MPSO) as a chemical probe. Results from radical quenching and electron paramagnetic resonance (EPR) experiments indicate that the free radicals (i.e., •OH and SO4•−) play only a minor role in the degradation of sulfamethoxazole (SMX). A mechanism involving Co(II)-PMS complex both on the surface of CoFe2O4 and in solution as the dominant reactive species is proposed. Furthermore, the degradation performance of SMX under different conditions were investigated to further cognize the Co(II)-PMS complex-mediated oxidation process. This study broadens our understanding of the role of transition metal-based catalysts in the activation of PMS for the degradation of organic pollutants.
topic Peroxymonosulfate
Advanced oxidation processes
Cobalt ferrite
Water treatment
Co(II)-PMS complex complex
url http://www.sciencedirect.com/science/article/pii/S2666821121000594
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AT zihaozhao degradationoforganiccontaminantsinthecofe2o4peroxymonosulfateprocesstheoverlookedroleofcoiipmscomplex
AT hongchaoli degradationoforganiccontaminantsinthecofe2o4peroxymonosulfateprocesstheoverlookedroleofcoiipmscomplex
AT jieshuqian degradationoforganiccontaminantsinthecofe2o4peroxymonosulfateprocesstheoverlookedroleofcoiipmscomplex
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